Lions, tigers and polar bears! Oh my. The Memphis Zoo opens its gates for Tennessee residents to enjoy the zoo for free. People 17 years and older may bring their photo ID (ex: Tennessee Drivers license, current Tennessee college or Tennessee military) and enter the zoo for free. Persons 16 years old and under must be accompanied by an adult, age 21 or older. A $3 conservation fee will be charged to enter the China exhibit and the $5 parking fee will also apply.